As well as the resources provided by Sheffield Hallam University Library, you will find useful material at Sheffield City Council Libraries, so it is well worth becoming a member.
This material includes biographical and reference resources which Sheffield Hallam does not possess, as well a local studies collection which is invaluable for projects about Sheffield. The Central Library is in Surrey Street, just across the road from Adsetts Library.
Students who join the Sheffield Public Library can use their Library Card to access Who's Who & Who Was Who online free of charge. Simply go to the 24 hours web site, scroll down to the link to Who's Who and when you reach the login page enter your library card number, making sure you prefix it with shef.
You can also use the various newspaper databases under the News tab to look up obituaries to find biographical information about dead people.